An item with a cylindrical shaped body having external threads other than pipe or hose series. It is desinged to mate into a preformed threaded component for the purpose of plugging a hole during equipment operation. It may have a head and/or internal drive and may contain a bleeder hole. See also PLUG, PROTECTIVE, DUST AND MOISTURE SEAL and CAP-PLUG, PROTECTIVE, DUST AND MOISTURE SEAL. Excludes PLUG, TUBE FITTING, THREADED.